The Winnetka venture capitalist made fighting "government union bosses" a theme during the GOP primary. Unions also made the unusual move of endorsing a Republican in the primary: state Sen. Kirk Dillard of Hinsdale.

Quinn has traditionally enjoyed union support. However, public employee unions disagreed with his signing of a pension overhaul that cuts benefits for state employees and retirees.

SEIU represents roughly 170,000 workers in Illinois.

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